Undefatigable

adj

adj ·Rare ·Advanced level

Definitions

Adjective
  1. 1
    Obsolete form of indefatigable. alt-of, obsolete

    "undefatigable pains"

Etymology

From un- + defatigable.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.